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@other .tetes i @anni v@fitta` AL S. PETRIE, .OF HUDSON CITY, NEW JERSEY.

Letters .Patent IVO. 76,519, 4dated April 7, 1868.'

IMPROVEMENT IN WRENCH.-

To ALL WHOM 1r vMAY coNcERN:

Be it known .that I, A. S. PETRIE, of Hudson City,in the county of Hudson, and Stateof New Jersey, have invented'a new and useful Improvement in Wrenches; and I do hereby declare that the following is a full, clear, and exact description of 'the same, reference being had to the accompanying drawings, making a portion of this speciiicatiomin which- Figu-rel is a side view of a wrench made accordingto my invention.

Figure is a side view of the same,- taken at right angles to fig. 1.

Figure 3 is la longitudinal.'section"of the same.

Figure 4 is a detached view of one portion thereof.

Similar letters of reference indicate corresponding parts in all the figures.

This invention consists-in an obliquely-grooved or ribbed sliding key, so combined with the movable jaw and the obliquely-g'roovedvor ribbed shankof a monkey-wrench, that the aforesaid movable'jaw may be very readily tightened against the nut or other article to be turned by the wrench, by which means an implement of very simple and cheap construction, and one capable of, very convenient manipulation, is secured.

To enable others to understand the construction and operation of my invention, I' will proceed to describe it with reference'to thedrawings. l

The shankof the wrenchis shown at A, and is provided at one end with a suitable handle, Ai, and at the 'other with a fixed jaw, B* .Thatsidef the shank A, .atrvhicl is formedthe fixed jambes oblique transverse grooves, a, provided therein, the said grooves being preferably of angularshape, so that the surfaces of the, ribs IJ, between the said grooves, toward vthe' ixed jaw.A*, may form Hat shoulders at right angles to the length of the shank, as shown more clearly in'flgs. 1' and 2z Attached to the shank, by the slotted lugs C*, formed in any suitable manner, is the sliding jaw B, provided transversely `in the inner side of the innermost end portion of which is a transverse groove or socket, preferably of a somewhat dove-tailform, and having placedin it a kley, C, capable of moving longitudinally therein. This key C is'kept from slipping out endwise from its socket by means of`a screw or pin, c, extendingdown through the innermost part of the slidingjaw B, with its en'd fitting in'to a grooved, formed in the upper or uter side ofthe key C, and the Vshape and position of which are shown more clearly in fig. 2, and also in dotted outline in iig. 4i..v The key C is of less width than its socket, and has fitted behind it a spring,'., which retains it in-contact with theforward'side of the said socket, as-indicated more plainly in fig. 2, in orderthat'theinclined or semidovet'ail form of the said side of the socket may retain )the key fnomfalling out when lifted away from the shank, as hereinafter explained. Furthermore,

this key has'providedin its under or inner sidea series of oblique.grooves,f, corresponding to grooves a in the shank A, in such manner as the ribsf, between the grooves a of the shank. `The slot g, in the lug C*, of the sliding `iaw B, is longer than the width of 'the shank, and has placed between its outer end the adjacent surl face of the shank, a spiral or other spring, m, which operates to bring the key C down Aupon the obliquelygrooved side of the shank with its ribsfin theg'rooves a of the shank, as hereiubefore explained.

l In usi-ng the wrench, the key isffirst pushed outward, as indicated in red outline in tig. 2, andthe innermost lug 0*, of the movable or sliding jaw B, is pressed inward, compressing the springm, and bringing therkey C away from 'the grooved side or surface of the shank, whereupon the movable jaw may be moved longitudinally to bring it as close .as-may be to the nut,- bolt-head, or like article, which it is desiredf to turn, which being done, the aforesaid end of thejaw B is released frompressure, thus allowing the key to come upon the grooved surfacelcf the shank. The key is then pushed inward, and its oblique ribsf, acting upon or'against theshoulders formed, as bereinbefore set forth, by the oblique ribs b, between the grooves a, snugly tightens the movablejaw against such nut orarticle, the two obliquely-grooved surfaces of theshank and'key forming, as it were, two sets of inclined planes acting upon each other, to thus tighten, the jaw against thearticle to` be turned. Y'

In order to remove the wrench from such article, it is of course only necessary to move outward the key, thus sliding back the jaw B suiiiciently to permit-of such removal.

What I claim as my invention, and desire to secure by Letters Patent, is- V The obliquely-grooved or ribbed sliding key C, in combination with the movable jaw B and the obliquelygrooved or ribbed shank A, substantially as and foi' the purpose specified.

` l A. s. PETRIE.

Witnesses:

J. W. Goonies, A. Ln CLERC. 

